Footnotes in the new book Planes without Passengers

The official theory holds that American 11 and United 175 struck the World Trade Center, north and south towers, respectively, and that American 77 hit the Pentagon. United 93 is said to have crashed in Shanksville, Pennsylvania. Flights 11 and 175 left from Boston with Los Angeles destinations. Flight 77 left from Dulles Airport in Virginia, also headed for Los Angeles. Flight 93 left from Newark for San Francisco.